diff --git a/zilti/build-system/chicken.scm b/zilti/build-system/chicken.scm
index c366d84..a615151 100644
--- a/zilti/build-system/chicken.scm
+++ b/zilti/build-system/chicken.scm
@@ -44,7 +44,7 @@ EXTENSION is the file name extension, such as '.tar.gz'."
 
 (define %chicken-build-system-modules
   ;; Build-side modules imported and used by default.
-  `((guix build chicken-build-system)
+  `((zilti build chicken-build-system)
     (guix build union)
     ,@%gnu-build-system-modules))